JP2008026148A - Passing object detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a passing object detection device provided with a function for detecting a dishonest act. <P>SOLUTION: A light projection apparatus 3a and a light quantity measuring apparatus 3b are arranged on one side of the passing object detection device, and a reflector 4 is arranged on the other side, and the part between the both forms a detection region 5. Light emitted by the projection apparatus 3a is reflected by a passing object or the reflector 4, the quantity of reflected light is measured by the measuring apparatus 3b, and the detection device 2 detects the existence of a passing object. The detection device is equipped with a distance measuring means 6 for measuring the distance from the measuring apparatus 3b up to the reflector 4. The detection device is equipped with an informing means 8 for informing that at least one of the reflector 4 and the measuring apparatus 3b moves. The detection device is equipped with a distance comparison means 6 for comparing a distance from the measuring apparatus 3b up to the reflector 4 measured beforehand and the distance measured by the measuring means 6, and informs by the informing means 8 when the difference between the both deviates from a predetermined range set beforehand. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a passing object detection device that detects that an object has passed a predetermined area.

  Various passing-object detection devices that detect passing objects such as people and cars have been developed and utilized. Most of the passing object detection devices include a light projecting device and a light amount measuring device. The light amount measuring device is disposed opposite to the light projecting device with a passing object detection region interposed therebetween, and an infrared ray or a laser emitted from the light projecting device. The passing object is recognized by detecting a change in the amount of light received by the light amount measuring device with respect to the light projection amount (irradiation amount) of light such as light.

In addition, the light projecting device and the light amount measuring device are integrally configured, and a reflector (reflector) is disposed opposite to each other with the passing object detection region interposed therebetween, and the light beam projected by the light projecting device is reflected by the reflector, There has already been developed a passing object detection apparatus that employs a format in which reflected light is received by a light amount measuring apparatus. The type of passing object detection device that uses a reflector is simpler to wire than the type that faces the passing object detection area because the light projecting device and the light quantity measurement device are close (or integrated). This is advantageous in terms of cost. Such a passing thing detection apparatus is disclosed by patent document 1 grade | etc., For example.
JP 2000-338262 A

  By the way, in order to improve crime prevention, there is a growing need to detect the presence or absence of unauthorized intruders in houses by installing this passing object detection device in ordinary households. Has been.

  Passing object detection devices used in ordinary homes are required to be simple and inexpensive, and to be easily installed to the extent that they can be installed by users themselves. It is difficult to spread.

  At present, a passing object detection apparatus in which a light projecting device and a light amount measuring device are installed on one side and a reflector is installed across the light detection device and the passing object detection region is relatively simple in configuration and easy to install. So it is suitable for practical use.

  However, it is easy to install and easy to remove, and unauthorized intruders can move the reflector to the passing object detection area side (light receiving device side) to narrow the passing object detection area and illegally infiltrate the back side of the reflector. A dummy reflector of the same type is placed within the projection angle of the light beam that is passed to the person or projected by the light projecting device, and is crafted so that the reflected light always reaches the light quantity measuring device, and the passing object detection area It was completely defenseless against fraudulent acts that made it impossible to detect intrusions even if they pass through it.

  Accordingly, an object of the present invention is to provide a passing object detection device having a function of detecting that an illegal act has been performed.

  In the invention of claim 1 for solving the above-mentioned problem, a light projecting device and a light quantity measuring device are arranged on one side, a reflector is arranged on the other side at a predetermined interval, and a detection area is formed between the two. The light emitted from the light projecting device is reflected by a passing object or a reflector, and the reflected light reflected by the light amount measuring device is received to measure the amount of light, thereby detecting the presence or absence of a passing object passing through the detection region. In the passing object detection apparatus, the passing object detection apparatus includes a distance measuring unit that measures a distance from the light amount measuring device to the reflector.

  In the first aspect of the invention, since the distance measuring means for measuring the distance from the light quantity measuring device to the reflector is provided, it is possible to detect that the light quantity measuring device or the reflector has moved. That is, even if an attempt is made to intrude by illegally moving the light amount measuring device or the reflector, it is possible to detect that the light amount measuring device or the reflector has moved, so that the unauthorized intrusion can be detected in advance.

  According to a second aspect of the present invention, in the passing object detection apparatus according to the first aspect of the present invention, a notification means is provided for notifying that at least one of the reflector and the light quantity measuring device has moved.

  According to the second aspect of the present invention, since the notifying means for notifying that at least one of the reflector and the light quantity measuring device has moved is provided, it is possible to detect in advance that unauthorized intrusion has occurred. As the notification means, for example, it is effective to sound an alarm or blink an alarm lamp.

  According to a third aspect of the present invention, in the passing object detection apparatus according to the second aspect of the present invention, a distance comparing means for comparing a distance from the light amount measuring device measured in advance to the reflector and a distance measured by the distance measuring means is provided. As a result of comparison by the distance comparison means, when the difference between the two deviates from a predetermined range set in advance, the notification means notifies the user.

  When the invention of claim 3 is carried out, it is possible to reliably detect that at least one of the light quantity measuring device and the reflector has moved, and when the movement is further detected, the notification means notifies the user, and therefore unauthorized entry is made. This can be detected with certainty.

  When the passing object detection device is installed, it is desirable to measure a normal distance from the light amount measurement device to the reflector and store the measured value in a storage unit such as a memory in advance. The distance comparison means is preferably constituted by a CPU or the like having an arithmetic function, for example, and preferably compares the measured value stored in advance in the storage means with the newly measured value. As a result of comparison by the comparison means, if the difference between the two is within a preset predetermined range, neither the light quantity measuring device nor the reflector has moved, and conversely, the difference between the two deviates from the preset predetermined range. For example, it is determined that at least one of the light quantity measuring device and the reflector has moved. That is, it can be detected that the passing object detection device has been tampered with.

  According to a fourth aspect of the present invention, a light projecting device is disposed on one side, a light quantity measuring device is disposed on the other side at a predetermined interval, and a detection area is formed between the two, and the light projecting device emits the light. In the passing object detection device that detects the presence or absence of a passing object that passes through the detection region by receiving the light by the light amount measuring device and measuring the light amount, the distance for measuring the distance from the light projecting device to the light amount measuring device A passing object detection apparatus comprising a measuring means.

  When the invention of claim 4 is carried out, the distance from the light projecting device to the light quantity measuring device can be monitored, and even if one of them is moved illegally, it can be detected by the fluctuation of the distance.

  According to a fifth aspect of the present invention, in the passing object detection apparatus according to the fourth aspect of the present invention, a notification means for notifying that at least one of the light projecting device and the light amount measuring device has moved is provided.

  When the invention of claim 5 is carried out, even if one of the light quantity measuring device and the light projecting device is moved, it can be detected by the variation of the distance.

  According to a sixth aspect of the present invention, in the passing object detection apparatus according to the fifth aspect of the present invention, a distance comparing means for comparing a distance from the light projecting device measured in advance to the light quantity measuring device and a distance measured by the distance measuring means. As a result of comparison by the distance comparison means, when the difference between the two deviates from a predetermined range set in advance, the notification means notifies the difference.

  When the invention according to claim 6 is implemented, it is possible to reliably detect that at least one of the light quantity measuring device and the light projecting device has moved, and when the movement is further detected, the notification means notifies the unauthorized entry. It can be surely detected.

  A seventh aspect of the present invention employs a retroreflective element as a reflector in the passing object detection apparatus according to the first to sixth aspects of the present invention.

  In the invention of claim 7, since the retroreflective element is adopted as the reflector, the reflected light efficiently returns to the light quantity measuring device. As a result, when the passing object passes, the difference in the amount of light from the reflected light reflected by the passing object increases, and the presence or absence of the passing object can be detected more reliably. As the retroreflective element, for example, a corner cube mirror constituted by three surfaces orthogonal to each other can be employed.

  By implementing the present invention, it is possible to detect that the passing object detection device has been crafted by an unauthorized intruder. Therefore, crime prevention can be improved.

  In the following embodiment, the case where the passing material detection apparatus 2 of this invention is installed in the house 1 with a garden is illustrated. FIG. 1 is a perspective view of a house 1 in which the passing object detection devices 2a to 2c of the present invention are installed. As shown in FIG. 1, the passing object detection devices 2 a to 2 c each include a pair of light projecting and receiving devices 3 and a reflector (reflecting plate) 4.

  The passing object detection device 2a is installed on the roof 1a of the house 1, and the passing object detection device 2a is provided for an intruder who tries to intrude from an adjacent building (not shown). The passing object detection device 2b is installed on the veranda 1b on the second floor, and the passing object detection device 2b is provided for an intruder trying to enter through a wall. The passing object detection device 2c is installed in a fence that separates the inside of the site from the outside of the site, and the passing object detection device 2c is provided for an intruder who gets over the fence and enters the site.

  Although the passing object detection devices 2a to 2c are installed in the above-described places, the installation places can be arbitrarily selected, and the number of installations can be set as necessary. That is, it is preferable that a plurality of passing object detection devices 2 (2a to 2c) are stacked in the height direction so that an intruder can always detect even if they are squatting or jumping. Although the passing object detection devices 2a to 2c shown in FIG. 1 are depicted so as to be very conspicuous, in actuality, the passing object detection devices 2a to 2c are not so conspicuous as much as possible by using walls, columns, or the like. It is preferable to install in.

  Next, the configuration of the passing object detection device 2 will be described in detail. The passing object detection device 2 includes a pair of light projecting / receiving devices 3 and a reflector 4. The light projecting / receiving device 3 and the reflector 4 are provided in the house 1 as described above or at the entrance of a person or a car. The light projecting / receiving device 3 and the reflector 4 are arranged at a predetermined distance, and a detection region 5 is formed between them to allow a passing object to pass therethrough.

  The light projecting / receiving device 3 includes a light projecting unit 3a (light projecting device) that projects (irradiates) infrared light, laser light, or electromagnetic waves (all of which are harmless to the human body), and light projected from the light projecting unit 3a. A light receiving unit 3b (light quantity measuring device) that receives reflected light reflected by the passing object and the reflector 4 is provided.

  Since the reflectance of light differs by an order of magnitude between the reflector 4 and a passing object such as a person, the light receiving unit 3b can be operated even if a predetermined time elapses after the light is projected from the light projecting unit 3a. When the reflected light cannot be received, it can be determined that there is a passing object (a person or an object) in the detection area 5. If a laser diode and an optical system lens are provided in the light projecting unit 3a and the irradiated laser light is narrowed into a beam shape, the laser light can efficiently reach the far reflector 4 with a small output.

  In addition, the light projecting / receiving device 3 includes a fraud detection device 10 including an arithmetic device 6, a storage device 7, and a notification device 8, as shown in FIG. FIG. 2 is a system diagram of the fraud detection device 10 provided in the light projecting / receiving device 3. The fraud detection device 10 projects (irradiates) light from the light projecting unit 3a, the projected light is reflected by the reflector 4, and the time until the reflected light is received by the light receiving unit 3b is multiplied by the speed of the light. Then, the distance from the light projecting / receiving device 3 to the reflector 4 is calculated (measured). This calculation is performed by the calculation device 6.

  This calculation is performed when the passing object detection device 2 is installed, and is stored in the storage device 7 as a normal distance from the light projecting / receiving device 3 to the reflector 4 (that is, the length of the detection region 5). This is called initial setting. The passing object detection device 2 whose initial setting has been completed is in a usable state.

  The calculation device 6 calculates the distance from the light projecting / receiving device 3 to the reflector 4 at regular time intervals or every predetermined time (for example, about 0.5 seconds to 3 seconds), and further calculates the calculated value and the value stored in the storage device 7. Compare. As a result of the comparison between the arithmetic unit 6 and the difference between the two, if the difference between the two does not exceed a predetermined value, the passing object detection device 2 maintains a normal state, and the difference between the two exceeds a predetermined value. If so, it is determined that either the reflector 4 or the light projecting / receiving device 3 has been moved illegally.

  Here, the predetermined value set in advance is, for example, a size (for example, 20 cm) necessary for a person to pass through, and is stored in the storage device 7 in advance when the passing object detection device 2 is started to operate. If the difference between the calculated value of the calculation device 6 and the value stored in the storage device 7 exceeds this predetermined value, the calculation device 6 sends a command signal to the notification device 8 to notify it. As a notification method by the notification device 8, any method can be used as long as it can notify an abnormal situation such as sounding an alarm sound or blinking an alarm lamp.

  As the power source of the light projecting / receiving device 3, a household AC power source and various batteries (batteries) can be employed. In many cases, a power source (or wiring) is secured for a gate pole for an electric lamp or an interphone, and this power source can be used when the passing object detection device 2 is installed on the gate. Further, when a cartridge-type battery is employed as the power source, the passing object detection device 2 can be installed regardless of the installation location. For example, it is extremely effective to use a solar cell as a battery.

  Further, since the reflector 4 does not require a power source, it is only necessary to ensure the power source of the passing object detection device 2 for the light projecting / receiving device 3, and the installation can be facilitated. Therefore, the passing object detection apparatus 2 provided with the fraud detection apparatus 10 can be easily installed by the user himself. That is, the reflector 4 can be installed very easily with, for example, a double-sided tape.

  The reflector 4 may be formed of a flat reflecting plate, but it is preferable to employ a known corner cube mirror (retroreflective element) having three surfaces that are orthogonal to each other. When the corner cube mirror is adopted, it is not necessary to strictly adjust the installation angle of the reflector 4, and the installation of the reflector 4 becomes easy.

  At the initial setting, as described above, the distance from the light projecting / receiving device 3 to the reflector 4 is measured, and the measured value is stored in the storage device 7. At the same time, the amount of light emitted is adjusted according to the environment of the installation location. That is, in a place where there is a lot of dust such as exhaust gas or dirt, or a place where fog is likely to be generated due to moisture, the light projection amount is increased more than usual so that the light receiving device 3 can sufficiently receive the reflected light. To.

  If the situation becomes better than the initial setting after installation, the amount of light received by the light receiving device 3 is larger than that at the initial setting, and conversely, the amount of dust further increases. If the value deteriorates, the amount of light will be less than the initial setting. For this reason, the light amount received by the light receiving device 3 has a width of 50% in the vertical direction, for example, based on the light amount at the time of initial setting. That is, the lower limit value is 50% of the light intensity at the initial setting, and the upper limit value is 150% at the initial setting. If the light amount of 50% to 150% of the light amount at the time of initial setting is detected, the passing object detection device 2 has a function of determining that it is operating normally.

  As described above, the passing object detection apparatus 2 having the configuration described above can reliably detect the following illegal acts. FIG. 3A to FIG. 3D are conceptual diagrams showing a state in which each passing object detection device 2 is cheated.

  FIG. 3A shows a case where the reflector 4 is moved forward (projecting / receiving device 3 side) from the normal installation position. In the example shown in FIG. 3A, the detection area 5 is narrowed, and the calculation result by the calculation device 6 of the fraud detection device 10 is smaller than the value stored in advance in the storage device 7 at the time of initial setting. If the amount of forward movement exceeds a predetermined value set in advance (20 cm in the above example), the fraud detection device 10 determines that there is an intruder who has attempted unauthorized intrusion, and the notification device 8 causes an abnormality. Notify that this is the case.

  FIG. 3B shows a state in which another reflector 11 of the same type as the reflector 4 is arranged in front of the reflector 4. In the example shown in FIG. 3B, the distance from the light projecting / receiving device 3 to the reflector 4 does not change, but the light projected from the light projecting unit 3 a is reflected by the reflector 11 without reaching the reflector 4. . The reflected light reflected by the reflector 11 is received by the light receiving unit 3b, but it is substantially the same as when the reflector 4 is moved. After the light is projected from the light projecting unit 3a, the light receiving unit 3b Since the time until the reflected light is received is shortened, it is possible to detect that the passing object detection device 2 has been cheated.

  In FIG. 3C, four reflectors are arranged in the detection region 5, and the light projected from the light projecting unit 3a reaches the reflector 4 via the four reflectors 12a to 12d. Further, the reflected light reaches the light receiving unit 3b through the four reflecting plates 12a to 12d. If the reflecting plate 12b and the reflecting plate 12c are arranged on the upper side as shown in FIG. 3C, the light passing through the detection region 5 is detoured, and a person can pass without touching the light. However, in this case, the distance through which light passes is increased by the amount of detour through the four reflectors 12a to 12d, and as a result, the reflector 4 moves backward (in a direction away from the light projecting and receiving device 3). Is detected as follows. Thereby, it can recognize that the fraudulent act was performed, and can alert | report by the alerting | reporting apparatus 8 in order to prevent unauthorized intrusion.

  FIG. 3 (d) shows a case where another reflector 11 of the same type is installed beside the reflector 4. The light projected from the light projecting unit 3a has directivity but reaches a certain range. For example, as shown in FIG. 3 (d), when another reflector 11 of the same type is installed next to the reflector 4 within this range, there is an intruder in front of the reflector 4, and the reflected light from the reflector 4 is reflected. Even if it is blocked, the light reflected by the reflector 11 reaches the light receiving unit 3b. As a result, even if an intruder passes through the detection area 5, either the reflected light of the reflector 4 or the reflected light of the reflector 11 reaches the light receiving unit 3b. However, in the passing object detection device 2, the amount of light received by the light receiving unit 3b is set to be in the range of 50% to 150% of the amount of light at the initial setting, so that the reflector 11 is installed. The amount of light reaching the light receiving unit 3b is about 200%, and the fraud detection device 10 can detect that the amount of light has exceeded.

  Although the passing object detection apparatus 2 embodying the present invention can be used in a general home as described above, it can be easily installed. For example, an event hall that temporarily rents a place, an airport, It can also be used to detect the entry of people into the runway.

  In the above, the example in which the reflector is provided in the passing object detection device has been described. However, the present invention is also applied to the passing object detection device having a configuration in which the light projecting device and the light receiving device are arranged with a detection area therebetween and the reflector is not used. Can be applied.

It is a perspective view of the house which installed the passage detection device of the present invention. It is a systematic diagram of the fraud detection apparatus provided in the light projecting / receiving apparatus. (A)-(d) is a conceptual diagram which shows the state by which the fraudulent act was each made to the passage detection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 House 2 Passing object detection apparatus 3 Light projection / reception apparatus 3a Light projection part 3b Light reception part (light quantity measurement apparatus)
4 Reflector 5 Detection Area 6 Computing Device 7 Storage Device 8 Notification Device 10 Fraud Detection Device

Claims (7)

  A light projecting device and a light amount measuring device are arranged on one side, a reflector is arranged on the other side with a predetermined interval, and a detection area is formed between the two, and the light emitted by the light projecting device is a passing object or a reflector. In the passing object detection device that detects the presence or absence of a passing object that passes through the detection region by receiving the reflected light reflected by the light amount measuring device and measuring the light amount, from the light amount measuring device to the reflector A passing object detecting device comprising a distance measuring means for measuring the distance of the object.   The passing object detection device according to claim 1, further comprising a notification unit that notifies that at least one of the reflector and the light amount measurement device has moved.   A distance comparing means for comparing the distance from the light quantity measuring device measured in advance to the reflector and the distance measured by the distance measuring means, and as a result of comparison by the distance comparing means, a difference between the two is set in a predetermined range; The passing object detection apparatus according to claim 2, wherein the notification means notifies the passage object when it deviates from.   A light projecting device is arranged on one side, a light quantity measuring device is arranged on the other side with a predetermined interval, and a detection area is formed between the two, and the light quantity measuring device receives the light emitted by the light projecting device. In the passing object detection apparatus that detects the presence or absence of a passing object that passes through the detection region by measuring the amount of light, the apparatus includes a distance measuring unit that measures a distance from the light projecting device to the light amount measuring device. A passing object detector.   The passing object detection device according to claim 4, further comprising a notification unit that notifies that at least one of the light projecting device and the light amount measurement device has moved.   A distance comparison unit that compares the distance from the light projecting device measured in advance to the light amount measurement device and the distance measured by the distance measurement unit is provided. As a result of the comparison by the distance comparison unit, the difference between the two is set in advance. 6. The passing object detection apparatus according to claim 5, wherein when the vehicle deviates from a predetermined range, the notification means notifies the passage.   The passing object detection apparatus according to claim 1, wherein the reflector is a retroreflective element.

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